1. Preheat oven to 375º F.
2. In a large skillet, brown the ground beef and drain any remaining fat. Transfer to a bowl.
3. Add taco seasoning, tomatoes and green chiles to the ground beef and stir to combine.
4. Cut flour tortillas into a square shape and cut each into 4 smaller equally sized square pieces.
5. Generously coat a standard size muffin tin with nonstick cooking spray.
6. Line each cup of prepared muffin tin with a tortilla sheet.
7. Add 1.5 tablespoons taco mixture. Top with 1 tablespoon of cheese. Press down and add another layer of tortilla sheet, taco mixture, and a final layer of cheese.
8. Lightly brush the top edges of the tortilla with cooking oil.
9. Bake 18-20 minutes until cups are heated through and edges are golden brown.
10. Enjoy!